/*
 * AscEmu Framework based on ArcEmu MMORPG Server
 * Copyright (c) 2014-2023 AscEmu Team <http://www.ascemu.org>
 * Copyright (C) 2005-2011 MaNGOS <http://getmangos.com/>
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program. If not, see <http://www.gnu.org/licenses/>.
 */

#ifndef DBCFILE_H
#define DBCFILE_H
#include <cassert>
#include <string>
#include "StormLib.h"

class DBCFile
{
public:
    DBCFile(HANDLE mpq, const char* filename);
    ~DBCFile();

    // Open database. It must be openened before it can be used.
    bool open();

    // Database exceptions
    class Exception
    {
    public:
        Exception(const std::string &message) : message(message) { }
        virtual ~Exception() { }
        const std::string &getMessage() {
            return message;
        }
    private:
        std::string message;
    };

    class NotFound : public Exception
    {
    public:
        NotFound() : Exception("Key was not found") { }
    };

    // Iteration over database
    class Iterator;
    class Record
    {
    public:
        float getFloat(size_t field) const
        {
            assert(field < file._fieldCount);
            return *reinterpret_cast<float*>(offset + field * 4);
        }

        unsigned int getUInt(size_t field) const
        {
            assert(field < file._fieldCount);
            return *reinterpret_cast<unsigned int*>(offset + field * 4);
        }

        int getInt(size_t field) const
        {
            assert(field < file._fieldCount);
            return *reinterpret_cast<int*>(offset + field * 4);
        }

        char const* getString(size_t field) const
        {
            assert(field < file._fieldCount);
            size_t stringOffset = getUInt(field);
            assert(stringOffset < file._stringSize);
            return reinterpret_cast<char*>(file._stringTable + stringOffset);
        }

    private:
        Record(DBCFile& file, unsigned char* offset) : file(file), offset(offset) {}
        DBCFile& file;
        unsigned char* offset;

        friend class DBCFile;
        friend class DBCFile::Iterator;

        Record& operator=(Record const&);
        Record(Record const& right) : file(right.file), offset(right.offset)
        {
        }
    };
    /** Iterator that iterates over records
    */
    class Iterator
    {
    public:
        Iterator(DBCFile &file, unsigned char* offset) : record(file, offset) { }

        Iterator(Iterator const& right) : record(right.record)
        {
        }

        /// Advance (prefix only)
        Iterator& operator++()
        {
            record.offset += record.file._recordSize;
            return *this;
        }

        /// Return address of current instance
        Record const& operator*() const {
            return record;
        }
        Record const* operator->() const {
            return &record;
        }

        /// Comparison
        bool operator==(Iterator const& b) const
        {
            return record.offset == b.record.offset;
        }

        bool operator!=(Iterator const& b) const
        {
            return record.offset != b.record.offset;
        }

        Iterator& operator=(Iterator const& right)
        {
            record.offset = right.record.offset;
            return *this;
        }
    private:
        Record record;

    };

    // Get record by id
    Record getRecord(size_t id);
    /// Get begin iterator over records
    Iterator begin();
    /// Get begin iterator over records
    Iterator end();
    /// Trivial
    size_t getRecordCount() const {
        return _recordCount;
    }
    size_t getFieldCount() const {
        return _fieldCount;
    }
    size_t getMaxId();

private:
    HANDLE _mpq;
    const char* _filename;
    HANDLE _file;
    size_t _recordSize;
    size_t _recordCount;
    size_t _fieldCount;
    size_t _stringSize;
    unsigned char *_data;
    unsigned char* _stringTable;
};

#endif  //DBCFILE_H
